feat: multi-material overlays, presentation guides, and release prebuilds

Align control/presentation with presentation screen rect and darkness z-order; sync window titles and session window cleanup. Pack Win/Mac/Linux with npmRebuild disabled and release-native-prep for classic-level and sharp.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/i18n/editorMessages.ts

@@ -406,7 +406,7 @@ export const EDITOR_MESSAGES: Record<EditorLocale, Record<string, string>> = {
     'materials.dropHint': 'Перетащите изображение (PNG, JPG, WebP)',
     'materials.tileMenu': 'Меню материала',
     'materials.windowEmpty': 'Добавьте материалы в редакторе.',
-    'materials.closeOverlay': 'Закрыть материал',
+    'materials.closeOverlay': 'Закрыть материалы',
     'materials.rotateOverlay': 'Повернуть',
     'materials.deleteTitle': 'Удаление материала',
     'materials.deleteConfirm': 'Вы уверены, что хотите удалить материал «{name}»?',
@@ -977,7 +977,7 @@ export const EDITOR_MESSAGES: Record<EditorLocale, Record<string, string>> = {
     'materials.dropHint': 'Drop an image (PNG, JPG, WebP)',
     'materials.tileMenu': 'Material menu',
     'materials.windowEmpty': 'Add materials in the editor.',
-    'materials.closeOverlay': 'Close material',
+    'materials.closeOverlay': 'Close materials',
     'materials.rotateOverlay': 'Rotate',
     'materials.deleteTitle': 'Delete material',
     'materials.deleteConfirm': 'Are you sure you want to delete material “{name}”?',